A simple echo service

For some testing, I needed a simple HTTP server which would print headers that my client is
sending (and some headers added by my proxy). I had written a simple HTTP server in python which did exactly what
I wanted, and added it to python container from dockerhub.

It was ridiculously large at ~260MB. Even the slim variants of python containers were ~75MB.

So, thought to write the same in Go (for fun, and result of single static binary), and just add it to busybox container.
Result was a tiny ~5MB container as busybox base itself is tiny (<1MB) set of tools, and nothing else. One can even use
scratch
instead of busybox as basecontainer when the binary is not dependent on anything like this go binary.